ArticlePDF Available

Perceptions and expectations of autonomous vehicles – A snapshot of vulnerable road user opinion

Authors:

Abstract and Figures

Public perceptions play a crucial role in wider adoption of autonomous vehicles (AVs). This paper aims to make two contributions to the understanding of public attitudes toward AVs. First, we explore opinions regarding the perceived benefits and challenges of AVs among vulnerable road users – in particular, pedestrians and bicyclists. Second, the paper evaluated whether interaction experiences with AVs influence perceptions among vulnerable road users. To explore this, we examined survey data collected by Bike PGH, a Pittsburgh based organization involved in programs to promote safe mobility options for road users. Analysis of the data revealed that respondents with direct experience interacting with AVs reported significantly higher expectations of the safety benefits of the transition to AVs than respondents with no AV interaction experience. This finding did not differ across pedestrian and bicyclist respondents. The results of this study indicate that as the public increasingly interacts with AVs, their attitudes toward the technology are more likely to be positive. Thus, this study recommends that policy makers should provide the opportunities for the public to have interaction experience with AVs. The opportunities can be provided through legislation that allows auto manufacturers and technology industries to operate and test AVs on public roads. This interactive experience will positively affect people's perceptions and help in wider adoption of AV technology.
Content may be subject to copyright.
Contents lists available at ScienceDirect
Technological Forecasting & Social Change
journal homepage: www.elsevier.com/locate/techfore
Perceptions and expectations of autonomous vehicles A snapshot of
vulnerable road user opinion
Praveena Penmetsa
a,
, Emmanuel KoAdanu
a
, Dustin Wood
a
, Teng Wang
b
, Steven L. Jones
c
a
Alabama Transportation Institute, The University of Alabama, Cyber Hall, Tuscaloosa, AL 35487, United States of America
b
Texas A&M Transportation Institute, 1100 NW Loop 410, Suite 400, San Antonio, TX 78213, United States of America
c
Department of Civil, Construction, and Environmental Engineering, The University of Alabama, Cyber Hall, Tuscaloosa, AL 35487, United States of America
ARTICLE INFO
Keywords:
Autonomous vehicles
Vulnerable road users
Perception
Pedestrians
Safety
Bicyclist
ABSTRACT
Public perceptions play a crucial role in wider adoption of autonomous vehicles (AVs). This paper aims to make
two contributions to the understanding of public attitudes toward AVs. First, we explore opinions regarding the
perceived benets and challenges of AVs among vulnerable road users in particular, pedestrians and bicyclists.
Second, the paper evaluated whether interaction experiences with AVs inuence perceptions among vulnerable
road users. To explore this, we examined survey data collected by Bike PGH, a Pittsburgh based organization
involved in programs to promote safe mobility options for road users. Analysis of the data revealed that re-
spondents with direct experience interacting with AVs reported signicantly higher expectations of the safety
benets of the transition to AVs than respondents with no AV interaction experience. This nding did not dier
across pedestrian and bicyclist respondents. The results of this study indicate that as the public increasingly
interacts with AVs, their attitudes toward the technology are more likely to be positive. Thus, this study re-
commends that policy makers should provide the opportunities for the public to have interaction experience
with AVs. The opportunities can be provided through legislation that allows auto manufacturers and technology
industries to operate and test AVs on public roads. This interactive experience will positively aect people's
perceptions and help in wider adoption of AV technology.
1. Introduction
Autonomous vehicles (AVs) are capable of sensing their environ-
ments and navigating dierent trac conditions with little or no
human input (Skeete, 2018). By reducing the input of a human op-
erator, AVs have the potential to reduce trac congestion while im-
proving fuel eciency, reducing air pollution, and mitigating climate
change (Forrest and Konca, 2007.; Tientrakool et al., 2011;Atiyeh,
2012.; Shladover et al., 2012.; Plumer, 2017.; LaFrance, 2018). Re-
search ndings reveal that human factors are responsible for more than
90% of all crashes involving automobiles (Automated Driving Systems,
2017). Many industry experts believe that the transition to AVs will
signicantly improve road safety (Forrest and Konca, 2007;Plumer,
2017;Fagnant and Kockelman, 2018;Reimer, 2014;Hayes, 2011;
Silberg et al., 2012).
On March 18, 2018, however, an Uber struck and killed a pedestrian
in Arizona. This crash garnered worldwide media attention as the ve-
hicle was operating with a self-driving system at the time of the
collision. Questions related to the safety performance and acceptance of
these technologies (autonomous vehicle, self-driving) immediately
surfaced especially in relation to their ability to interact with vul-
nerable road users, a term generally used to refer to pedestrians, bi-
cyclists, and motorcyclists (Barth, 2017;Fairley, 2018;Levin, 2018).
We present a study of safety perceptions of AVs among vulnerable road
users and report how they relate to exposure to the technology.
2. Background
Recent advances in AV technology by automotive companies (e.g.,
General Motors, Ford, Daimler, Renault-Nissan) and tech companies
(e.g., Google, Uber, Waymo) have accelerated the development, testing,
and deployment of AVs within a much shorter time than previously
anticipated (Muoio, 2018). Researchers, private organizations, and in-
dustry experts have made eorts in predicting the adoption rates of AVs
(Bansal and Kockelman, 2017;Hars, 2018;Laslau et al., 2014;Lavasani
et al., 2016;Levinson and Krizek, 2015;Litman, 2018;Mosquet et al.,
https://doi.org/10.1016/j.techfore.2019.02.010
Received 18 October 2018; Received in revised form 4 February 2019; Accepted 26 February 2019
Corresponding author.
E-mail addresses: ppenmetsa@ua.edu (P. Penmetsa), ekadanu@ua.edu (E.K. Adanu), dustin.wood@cba.ua.edu (D. Wood), Teng-Wang@tti.tamu.edu (T. Wang),
sjones@eng.ua.edu (S.L. Jones).
Technological Forecasting & Social Change 143 (2019) 9–13
0040-1625/ © 2019 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/BY/4.0/).
T
2015;Rowe, 2018;Silberg et al., 2012). Several factors such as reg-
ulations, willingness to pay, and technology prices play a crucial role in
wide adoption of AVs (Hohenberger et al., 2016;Payre et al., 2014).
Many researchers have also explored the role of public perceptions and
acceptance in greater adoption of AVs (Fagnant and Kockelman, 2018;
Fairley, 2018;Litman, 2018;Hohenberger et al., 2017;Bansal and
Kockelman, 2017;Lavasani et al., 2016;Gold et al., 2015;Heide and
Henning, 2006). This logically follows from the fact that the public will
ultimately play a crucial role in purchasing vehicles with AV-related
technology and supporting (or opposing) policies and electing politi-
cians that will make it easier for AVs to share the roadways with other
users.
Understanding public perceptions of AVs is thus a crucial compo-
nent of knowing the rate at which the technology will become im-
plemented (Hengstler et al., 2016) For instance, Casley et al. (2013)
designed a survey to assess public feelings, beliefs, expectations, and
predictions toward AVs. Secondary traits of AVs such as their expected
productivity, eciency, environmental impact were appealing to the
public. A survey conducted by Schoettle and Sivak (2014) found that
respondents in the United States, United Kingdom, and Australia (a)
have positive initial opinion of this technology, (b) have high ex-
pectations on benets derived from AVs, (c) express concern about
riding in AVs, and security issues related to AVs, and (d) desire to have
self-driving technology in their vehicle without paying extra. Similar
results regarding the acceptance, concerns, and willingness to pay for
AVs were reported in a study of over 5000 respondents from 109
countries conducted by Kyriakidis et al. (2015) (Kyriakidis et al., 2015).
A series of focus-group meetings conducted with people from Los An-
geles, Chicago, and Iselin by KPMG (2013) found public acceptance of
AVs to vary by geographic location and gender. Females are more in-
terested in AV technologies than males, with females emphasizing
perceived benets of self-driving vehicles, and males expressing con-
cerns about being restricted by speed limits. This contradicts the results
form Hulse et al. (2018) - males displayed greater acceptance to AV
technology. Interestingly, this study found that the oldest respondents
(60+ year-old) and the youngest (2134 year-olds) expressed the
highest willingness to pay for self-driving technologies. According to a
research by Howard and Dai (2014), survey respondents viewed safety
and convenience as the most attractive features of AVs whereas, liabi-
lity and cost were the least attractive elements (Howard and Dai, 2014).
In a study of over 3500 London residents, Begg (2014) found 60% of
respondents agreed or strongly agreed that AVs would improve safety
for road users. Payre et al. (2014) observed that older people were more
likely to accept AVs but less likely to pay for this technology.
Underwood (2014) conducted a survey at Automated Vehicle Sympo-
sium 2014 and gathered opinions of 217 AV experts. The AV experts
believed that social and consumer acceptance were the least dicult
barriers while liability and regulations were the most dicult barriers
to the adoption of AVs. Finally, Deb et al. (2017) found in a study that
67% of respondents expected AVs to improve the overall transportation
system, but over 40% stated they will not feel comfortable if their child,
spouse, parents, or their loved ones cross roads in the presence of AVs.
Males, younger respondents, and respondents from urban areas were
more receptive toward AVs.
A review of existing literature reveals some interesting limitations in
the current understanding of public perception and acceptability of
AVs:
Presently, encounters with AVs on the roadways represent largely a
hypothetical future for most people. Therefore, their indications of
acceptability and/or expectations may not be solid ground for future
adoption of AVs, given that an individual's beliefs about how they
will feel about future events can be highly inaccurate (Wilson and
Gilbert, 2005). Indeed, Sims et al. (2018) have shown that having a
prior experience with a travel mode can lead to a more accurate
prediction about it (Sims et al., 2018).
Only few respondents to past surveys regarding attitudes and beliefs
related to AVs involve people who have directly interacted with
AVs. Given this lack of experience or interactions with AVs, most
respondents only have a vague idea about how they will actually
value these technologies when they arrive, which can lead to both
seriously overestimating or underestimating their value (Vilimek
and Keinath, 2014).
Further, the past surveys have largely ignored the assessment of
attitudes and beliefs of vulnerable road users (non-motorists).
To overcome the limitations of the existing literature, this paper
aims to: 1) explore opinions regarding the perceived benets and
challenges of AVs among vulnerable road users (i.e., pedestrians and
bicyclists); and 2) evaluate whether interaction with AVs changes
perceptions among vulnerable road users. Finally, we provide insights
to aid policy makers for better public acceptance and wider adoption of
AV technology. The study analyzes data obtained from a third-party
organization, Bike PGH. Bike PGH conducted a survey and gathered
responses from Pittsburgh residents on their experiences, perceptions,
and level of support to AVs deployed in Pittsburgh, Pennsylvania.
3. Methodology
In 2017, United States Department of Transportation (USDOT) de-
signated ten AV proving grounds to encourage testing of new technol-
ogies, which included Pittsburgh, PA. Since September 2016, Uber's
self-driving cars have been tested on the streets of Pittsburgh by pro-
viding rides for the public. By March 2017, there were 20 Uber AVs in
Pittsburgh serving over 800 trips per week (Bhuiyan, 2018).
Bike PGH, an organization promoting safety and accessibility for
bikers and pedestrians, conducted a survey to better understand the
attitudes and beliefs of Pittsburgh, Pennsylvania residents regarding
sharing roads with AVs. Bike PGH conducted the survey in two stages:
a) rst, exclusively to the donor members of the Bike PGH group, and b)
second, a general public survey. The general public survey aimed at
gathering responses from the Pittsburgh residents. Bike PGH promoted
the survey through their website, social media, and news articles. The
data was then provided to Western Pennsylvania Regional Data Center
and made public.
4. Results
Bike PGH gathered 321 responses from their members and 798 re-
sponses from general public. Initial results of the data were presented
by Bike PGH (AV Survey Results, 2018). However, most of their ana-
lysis concentrated on comparisons of responses between Bike PGH
members and general public. Their results clearly showed that Bike
PGH members have more positive attitudes and beliefs regarding AVs
than the general public. Because our interests were to examine a more
representative sample, in the present study analyses were limited to the
798 responses from survey of the general public (only 384 were needed
for 95% a condence level). Descriptive statistics of the original survey
data are summarized in Table 1.
Among the survey respondents, 46% stated that they had interacted
with an AV while using sidewalks and crosswalks, and 43% have not
had any interactions with an AV as a pedestrian. Among the re-
spondents, 11% were not sure if they had interactions with AVs as
pedestrians. Thirty-ve percent of the respondents reported having
interacted with AVs while riding a bicycle. A reasonable number of
respondents had interactions/experiences with AVs, which is necessary
for the kind of comparisons made in this study.
Approximately half of the respondents (49%) fully approved of
Pittsburgh serving as a proving ground for AVs. Only 10% of the re-
spondents fully disapproved, and 13% reported neutral attitudes.
Combing both approve and somewhat approve, close to 70% of the
people approved of their city serving as a proving ground for this
P. Penmetsa, et al. Technological Forecasting & Social Change 143 (2019) 9–13
10
technology.
Respondents expressed their observations or circumstances during
their interaction with AV. Since the data was freely provided on the
public domain, the data providers converted the descriptive variable
into 5 level categorical variable. Among the respondents who had in-
teraction experience with AVs, 70% stated that they didn't nd any
dierence between a human driver or experienced no negative inter-
action with an AV. Around 12% of the respondents who had interac-
tions, experienced AVs more cautious or had diculty anticipating AV
movement. Only 6% of the respondents perceived AVs as being safer
than humans.
Among the respondents, 62% reported that AVs have the potential
to reduce both fatalities and injuries. Only 8% of the respondents
clearly stated no and another 30% reported Maybeor Not Sure
(Table 1). Of the survey respondents, 70% felt that authorities should
lay regulations regarding how AVs are tested.
Regarding beliefs about the safety of sharing roads with human
drivers as pedestrians or bicyclists, the respondents' responses were
diverse; 4% of the respondents rated Pittsburgh streets as very safe,
39% stated moderately safe, and only 6% felt their city roads very
unsafe. Among the respondents, 21% rated Pittsburgh streets very safe,
and 36% stated safe. Interestingly, respondents rated sharing roads with
humans (mean = 2.95 on the scale given in Table 1) as less safe than
sharing the roads with AVs (mean = 3.53). Table 2 displays public's
opinions on how safe they feel using Pittsburgh's streets with human
drivers and AVs.
Respondents had more positive beliefs regarding the safety of
sharing the road with AVs if they had past interactions with AVs
(M= 3.70) than if they had not (M= 3.35). This dierence was sta-
tistically signicant (p= 0.0003). In contrast, respondents shared si-
milar attitudes about the safety of sharing roads with human drivers
regardless of whether they had experience interacting with AVs
(M= 2.92) or had not (M= 3.00). This dierence was not statistically
signicant (p= 0.23). This discrepancy is important as it indicates that
exposure to AVs was associated specically with dierences in the
perceived safety of AVs but did not systematically aect the perceived
safety of human drivers. Respondents with interactive experience have
signicantly high expectations than respondents without interactions
with AVs. In general, public expectations were high on safety benets
from AVs. This observation is similar to previous ndings of Schoettle
and Sivak (2014),Casley et al. (2013), and Deb et al. (2017).
Table 3displays vulnerable road users' opinion on Pittsburgh as the
proving ground for AVs by their interactive experience with AV. Since
the responses are ordinal (1-disapprove, 2-somewhat disapprove, 3-
neutral, 4-somewhat approve, 5-approve).
The mean reported approval of Pittsburgh as an AV proving ground
was 4.10 for respondents who had interacted with AVs as pedestrians,
whereas approval was only 3.67 for respondents with no interaction
experience as pedestrians; a one-way ANOVA indicated this dierence
was statistically signicant at a 95% condence level (p= 0.0002).
Similarly, respondents reported more positive attitudes toward AVs if
they had interacted with AVs as bicyclists (M= 4.06) than if they had
not (M= 3.78); this dierence was again signicantly dierent
(p= 0.02). These results indicate that interacting with AVs as a vul-
nerable road user was associated with increasing acceptance of this
technology.
Table 4 provides the mean perceptions of respondents concerning
on potential safety benets with AVs.
Among pedestrians who had interactive experience, 67% stated that
AVs have great potential to reduce trac fatalities and injuries. Only
6% of the same group felt AVs can't improve safety on roads. As tested
Table 1
Descriptive statistics of the data.
Question Response Frequency
Have you interacted with an AV while using
sidewalks and crosswalks in Pittsburgh?
No 344 (43%)
Not sure 84 (11%)
Yes 371 (46%)
Have you interacted with an AV while riding your
bicycle on the streets of Pittsburgh?
No 448 (56%)
Not sure 74 (9%)
Yes 277 (35%)
How do you feel right now about the use of
Pittsburgh's public streets as a proving ground
for AVs?
1 (approve) 390 (49%)
2 154 (19%)
3 107 (13%)
4 72 (9%)
5 (disapprove) 76 (10%)
On a typical day, how safe do you feel using
Pittsburgh's streets with human-driven cars?
1 (very unsafe) 43 (6%)
2 215 (27%)
3 308 (39%)
4 193 (24%)
5 (very safe) 34 (4%)
On a typical day, how safe do you feel using
Pittsburgh's streets with autonomous
vehicles?
1 (very unsafe) 50 (7%)
2 80 (11%)
3 177 (25%)
4 255 (36%)
5 (very safe) 153 (21%)
Do you think that AVs have the potential to reduce
injuries and fatalities?
Yes 493 (62%)
No 63 (8%)
Maybe 174 (22%)
Not sure 69 (8%)
On public streets, do you think that a regulatory
authority should come up with regulations
regarding how AVs are tested?
Yes 559 (70%)
No 103 (13%)
Not sure 137 (17%)
If you have had AV interactions, what were the
circumstances? What were your observations?
(a) 30 (6%)
(b) 383 (71%)
(c) 67 (12%)
(d) 37 (7%)
Other 22 (4%)
Note. Responsecolumn provides the response option presented to survey re-
spondents. (a) - AVs are safer than a human driver (b) - no dierence between a
human driver or experienced no negative interaction with an AV; (c) - experi-
enced AV more cautious or slower than a human driver or that respondents had
diculty anticipating movement of an AV; (d) - respondent reported having or
witnessing a negative interaction with an AV.
Table 2
Safety perception of Pittsburgh residents.
How safe do you feel
using Pittsburgh's
streets with
Interactive
experience with
AV
Response (1-very unsafe & 5-
very safe)
p-Value
Sample Mean Std.
dev.
Human drivers Yes 370 2.92 0.91 0.23
No 339 3.00 0.96
Not sure 84 2.82 1.00
AV Yes 364 3.70 1.10 0.0003
No 274 3.35 1.21
Not sure 77 3.38 1.04
Signicant at 95% condence level.
Table 3
Public opinion on Pittsburgh as the proving ground for AVs.
Vulnerable
road user
Interactive
experience
with AV
How do you feel right now about the use of
Pittsburgh's public streets as a proving ground for
AVs? (1-disapprove & 5-approve)
Sample Mean Std.
dev.
p-Value
Pedestrian Yes 371 4.10 1.30 0.0002
No 344 3.67 1.38
Not sure 84 3.83 1.36
Bicyclist Yes 277 4.06 1.33 0.02
No 448 3.78 1.36
Not sure 74 3.88 1.31
Note: p-value is obtained from ANOVA.
Signicant at 95% condence level.
P. Penmetsa, et al. Technological Forecasting & Social Change 143 (2019) 9–13
11
by the chi-square statistic, the interactive experience of pedestrians had
statistically signicant eect on their perceptions about AVs safety
potential to reduce injuries and fatalities at 95% condence level (p-
value is 0.037). Similarly, bicyclists who had interactive experience
were signicantly more likely to perceive that AVs have great potential
to reduce trac injuries and fatalities. Irrespective of the type of vul-
nerable road user, respondents described being more likely to envision
the safety benets of AVs if they had past interactions with AVs.
The respondents of the survey also expressed their opinions on
imposing regulations for AV testing and Table 5 presents those results.
Respondents who have interacted with AVs as pedestrians, 65% of
them stated that authorities should lay regulations for AV testing,
whereas 76% of the pedestrians who haven't interacted said regulations
are necessary. The dierence was statistically signicant at 95% con-
dence level. The same result was found among bicyclists.
Approximately 10% of the pedestrians and bicyclists who had not in-
teracted with AVs responded that regulations are not necessary,
whereas this percentage increased to 16%, and 18% among the pe-
destrians and bicyclists who had interacted with AVs.
5. Discussion & conclusion
Public perception plays a crucial role in the rate of new technology
acceptance and adoption by personals choices to adopt and willingness
to support government actions to support changes. Presently, the rate at
which AVs become a part of the transportation system is determined in
no small part by political decisions regarding how to regulate the
technology, support testing, and assess liability for accidents, and these
decisions in turn are considerably inuenced by the attitudes of poli-
tical constituents. This paper investigated opinions of a specic subset
of stakeholders, vulnerable road users, on the benets, experiences, and
perceived challenges with AVs. This paper further evaluated whether
interaction experiences with AVs could change perceptions among
vulnerable road users and also provide policy recommendations for
wider acceptance of this technology.
The results of this study provide some of the rst evidence that
interactions with AVs of vulnerable road users increase perceptions of
safety and approval of this technology. This suggests that as the public
has increased opportunities to interact with AVs even without con-
sidering further advances beyond current technologies attitudes to-
ward the technology would be expected to improve.
Presently, there is considerable geographic variation in the extent to
which people may have such experiences, due to wide variation in the
regulations concerning the ability to operate AVs on public roads.
According to the Insurance Institute for Highway Safety (IIHS) by
January 2018, 23 states and District of Columbia have enacted some
form of legislation or executive orders on autonomous vehicles: seven
authorize testing; seven simply authorize a study or funding, or dened
terms; nine states and DC authorize full deployment (Automation and
Crash Avoidance, 2018).
Across the US, there are only a handful of places where AVs are
tested or operated on public roads. After the fatal pedestrian crash in-
volving Uber, Arizona Governor Doug Ducey issued an Executive Order
to suspend all the testing of Uber autonomous vehicles on public
roadways in Arizona (Schwartz, 2018). This crash attracted attention
from all over the country and raised more questions related to the safety
performance and acceptance of the AV technology. According to Groves
and Kalra (2017), even with the current concerns and obstacles sur-
rounding AVs, the testing and deploying of AVs on the public road
should be promoted before the AV technology is nearly perfect at the
SAE level 5. Early deployment of AVs would save many lives instead of
waiting until they become nearly perfect (Groves and Kalra, 2017;
Skeete, 2018).
In view of the ndings of this study, it is recommended that, policy
makers should provide opportunities for the public to have interaction
experience with AVs. The opportunities can be provided through leg-
islation that allows auto manufacturers and technology industries to
operate and test AVs on public roads. This interactive experience will
positively aect people's perceptions and help in wider adoption of AV
technology.
The data used for this study was obtained from a study conducted by
Bike PGH, an organization that advocates for safer communities for
bikers and pedestrians. Given the sample collecting strategy through
social media, the sample might over-represent bicycle-users relative to
the total Pittsburgh population. The results of the study still provide
important evidence that experiences with AVs are associated with
systematic dierences in how AVs are perceived.
Funding source
This research was conducted using internal funds from the Alabama
Transportation Institute at the University of Alabama.
References
Atiyeh, C., 2012. Predicting Trac Patterns, One Honda at a Time. In: MSN Auto, (June).
Automated Driving Systems 2.0: A Vision for Safety. Publication DOT HS 812 442.
USDOT, United States Department of Transportation.
Bansal, P., Kockelman, K.M., 2017. Forecasting Americans' long-term adoption of con-
nected and autonomous vehicle technologies. Transp. Res. A Policy Pract. 2017 (95),
4963.
Barth, S. Video: Nissan driverless car in cyclist close pass. Road.cc., March 2017. http://
road.cc/content/news/218523-video-nissan-driverless-car-cyclist-close-pass.
Accessed July 17, 2018.
Begg, D., 2014. A 2050 Vision for London: What Are the Implications of Driverless
Transport? Clear Channel. .
Bhuiyan, J. Uber's autonomous cars drove 20,354 miles and had to be taken over at every
mile, according to documents. Recodewww.recode.net/2017/3/16/14938116/uber-
travis-kalanick-self-driving-internal-metrics-slow-progress, Accessed date: 4 January
2018.
AV survey results. Bike PGH, Pittsburghwww.bikepgh.org/resources/save/survey/,
Accessed date: 23 January 2018.
Casley, S., A. Jardim, A. Quartulli. A Study of Public Acceptance of Autonomous Cars.
Bachelor of Science thesis. Worcester Polytechnic Institute, Worcester, MA, USA,
2013.
Deb, S., Strawderman, L., Carruth, D.W., DuBien, J., Smith, B., Garriso, T.M., 2017.
Development and validation of a questionnaire to assess pedestrian receptivity
Table 4
AVs potential to improve safety.
Vulnerable
road user
Interactive
experience
with AV
Do you think that AVs have the
potential to reduce injuries and
fatalities?
p-Value
Yes No Maybe Not
sure
Pedestrian Yes 67% 6% 19% 8% 0.037
No 58% 10% 22% 10%
Not sure 52% 7% 33% 7%
Bicyclist Yes 70% 6% 17% 6% 0.006
No 58% 9% 23% 10%
Not sure 53% 9% 31% 7%
Statistical signicance at 95% condence level.
Table 5
Public's opinion on imposing regulation for AV testing.
Vulnerable road
user
Interactive
experience with
AV
Should authorities come up
regulations for AV testing
p-Value
Yes No Not sure
Pedestrian Yes 65% 16% 19% 0.007
No 76% 10% 14%
Not sure 68% 12% 20%
Bicyclist Yes 63% 18% 19% 0.034
No 75% 9% 16%
Not sure 68% 15% 18%
Signicant at 95% condence level.
P. Penmetsa, et al. Technological Forecasting & Social Change 143 (2019) 9–13
12
toward fully autonomous vehicles. Transportation research part C: emerging tech-
nologies 84, 178195.
Fagnant, D.J., Kockelman, K.M., 2018. Dynamic ride-sharing and eet sizing for a system
of shared autonomous vehicles in Austin, Texas. Transportation 45 (1), 143158.
Fairley, P. The self-driving car's bicycle problem. IEEE Spectrumhttps://spectrum.ieee.
org/cars-that-think/transportation/self-driving/the-selfdriving-cars-bicycle-problem,
Accessed date: 17 July 2018.
Forrest, A., M. Konca. Autonomous Car & Society In. Worcester Polytechnic Institute,
Worcester, MA, 2007. vol. IQP OVP 06B1.
Gold, C., Körber, M., Hohenberger, C., Bengler, K., 2015. Trust in automation before and
after the experience of take-over scenarios in a highly automated vehicle. Procedia
Manufacturing 3, 30253032.
Groves, David G., Kalra, Nidhi, 2017. Enemy of Good: Autonomous Vehicle Safety
Scenario Explorer. RAND Corporation, Santa Monica, CA. https://www.rand.org/
pubs/tools/TL279.html.
Hars, A. Autonomous vehicle roadmap: 20152030. Driverless car market watch. www.
driverless-future.com/?p=678, Accessed date: 4 January 2018.
Hayes, B., 2011. Leave the driving to it. Am. Sci. 99 (5), 362.
Heide, A., Henning, K., 2006. The cognitive car: a roadmap for research issues in the
automotive sector. Annu. Rev. Control. 30 (2), 197203.
Hengstler, M., Enkel, E., Duelli, S., 2016. Applied articial intelligence and trust the
case of autonomous vehicles and medical devices. Technol. Forecast. Soc. Chang.
105, 105120.
Hohenberger, C., Spörrle, M., Welpe, I., 2016. How and why do men and women dier in
their willingness to use automated cars? The inuence of emotions across dierent
age groups. Transp. Res. A 94, 374385.
Hohenberger, C., Spörrle, M., Welpe, I., 2017. Not fearless, but self-enhanced: the eects
of anxiety on the willingness to use autonomous cars depend on individual levels of
self-enhancement. Technol. Forecast. Soc. Chang. 116, 4052.
Howard, D. and D. Dai. Public Perceptions of Self-driving Cars: The Case of Berkeley,
California. Presented at 93rd Annual Meeting of the Transportation Research,
Washington, D.C., 2014.
Hulse, L.M., Xie, H., Galea, E.R., 2018. Perceptions of autonomous vehicles: relationships
with road users, risk, gender and age. Saf. Sci. 102, 113.
Automation and crash avoidance. Insurance Institute for Highway Safetywww.iihs.org/
iihs/topics/laws/autonomous-vehicles?topicName=Automation%20and%20crash
%20avoidance, Accessed date: 16 January 2018.
Kyriakidis, M., Happee, R., de Winter, J.C., 2015. Public opinion on automated driving:
results of an international questionnaire among 5000 respondents. Transportation
Research Part F: Trac Psychology and Behavior 32, 127140.
LaFrance, A. Self-driving cars could save 300,000 lives per decade in America. The
Atlantichttps://www.theatlantic.com/technology/archive/2015/09/self-driving-
cars-could-save-300000-lives-per-decade-in-america/407956/,Accessed date: 17
July 2018.
Laslau, C., Holman, M., Saenko, M., See, K., Zhang, Z., 2014. Set Autopilot for Prots:
Capitalizing on the $87 Billion Self-driving Car Opportunity. Lux Research. .
Lavasani, M., Jin, X., Du, Y., 2016. Market Penetration Model for Autonomous Vehicles
Based on Previous Technology Adoption Experiences. Presented at 95th Annual
Meeting of the Transportation Research. D.C., Washington.
Levin, S. Uber admits to self-driving car problemin bike lanes as safety concerns mount.
The Guardian UShttps://www.theguardian.com/technology/2016/dec/19/uber-self-
driving-cars-bike-lanes-safety-san-francisco, Accessed date: 17 July 2018.
Levinson, D., Krizek, K., 2015. The End of Trac and the Future of Transport. Network
Design Lab. In: Kindle Editions.
Litman, T., 2018. Autonomous Vehicle Implementation Predictions: Implications for
Transport Planning. Victoria Transport Policy Institute 28.
Mosquet, X., Dauner, T., Lang, N., Rubmann, N., Mei-Pochtler, A., Agrawal, R., Schmieg,
F., 2015. Revolution in the Driver's Seat: The Road to Autonomous Vehicles. Boston
Consulting Group 11.
Muoio, D. Ranked: the 18 companies most likely to get self-driving cars on the road rst.
Business Insiderwww.businessinsider.com/the-companies-most-likely-to-get-
driverless-cars-on-the-road-rst-2017-4/, Accessed date: 4 January 2018.
Payre, W., Cestac, J., Delhomme, P., 2014. Intention to use a fully automated car: atti-
tudes and a priori acceptability. Transportation Research Part F: Trac Psychology
and Behavior 27, 252263.
Plumer, B. 15 ways that self-driving cars could transform our lives. Voxwww.vox.com/
2014/5/28/5756736/the-case-for-self-driving-cars, Accessed date: 22 December
2017.
Reimer, B., 2014. Driver assistance systems and the transition to automated vehicles: a
path to increase older adult safety and mobility? Public Policy & Aging Report 24 (1),
2731.
Rowe, R. Self-driving cars, timeline. Topspeedwww.topspeed.com/cars/car-news/self-
driving-cars-timeline-ar169802.html, Accessed date: 4 January 2018.
Schoettle, B., Sivak, M., 2014. A Survey of Public Opinion about Autonomous and Self-
driving Vehicles in the US, the UK, and Australia. University of Michigan
Transportation Research Institute.
Schwartz, D. Arizona governor suspends Uber's ability to test self-driving cars.
Reutershttps://www.reuters.com/article/us-autos-selfdriving-uber/arizona-
governor-suspends-ubers-ability-to-test-self-driving-cars-idUSKBN1H303K, Accessed
date: 17 July 2018.
Self-driving Cars: Are We Ready. KPMG.
Shladover, S., Su, D., Lu, X.Y., 2012. Impacts of cooperative adaptive cruise control on
freeway tracow. Transportation Research Record: Journal of the Transportation
Research Board 2324, 6370.
Silberg, G., R. Wallace, G. Matuszak, J. Plessers, C. Brower and D. Subramanian. Self-
driving cars: the next revolution. White Paper, KPMG LLP & Center of Automotive
Research, 2012. 36.
Sims, D., Matthews, S.A., Bopp, M.J., Rovniak, L.S., Poole, E., 2018. Predicting dis-
cordance between perceived and estimated walk and bike times among university
faculty, sta, and students. Transportmetrica A: Transport Science 1, 28.
Skeete, J., 2018. Level 5 autonomy: the new face of disruption in road transport.
Technological Forecasting & Social Change 134, 2234 (September).
Tientrakool, P., Y.C. Ho, and N.F. Maxemchuk. Highway capacity benets from using
vehicle-to-vehicle communication and sensors for collision avoidance. 2011 IEEE
Vehicular Technology Conference (VTC Fall), San Francisco, CA, 2011, pp. 15.doi:
https://doi.org/10.1109/VETECF.2011.6093130.
Underwood, S., 2014. Automated vehicles forecast vehicle symposium opinion survey.
Automated Vehicles Symposium 1517.
Vilimek, R. and A. Keinath. User-centred design and evaluation as a prerequisite for the
success of disruptive innovations: an electric vehicle case study. In Driver Acceptance
of New Technology: Theory, Measurement and Optimisation (M. Regan, T. Horberry,
A. Stevens, eds.), Ashgate, Farnham, 2014, pp. 169186.
Wilson, T.D., Gilbert, D.T., 2005. Aective forecasting: knowing what to want. Curr. Dir.
Psychol. Sci. 14, 131134.
Praveena Penmetsa is an Associate Research Engineer at University of Alabama's
Alabama Transportation Institute. Before joining UA, she worked for a year as a safety
research analyst at General Motors. She has extensive experience conducting research on
trac safety, driver behavior, road users' perceptions, etc. She has authored and co-au-
thored close to 20 scholarly journal publications and has presented her work at several
national and international conferences.
Emmanuel KoAdanu is a postdoctoral research associate at the Alabama
Transportation Institute (ATI). He has conducted extensive analysis of road safety data in
Alabama, as well as for Namibia and Ghana. He is passionate about identifying ways to
address various forms of disparities in transport. He has published in top transportation
safety journals and has been involved in both federal and state Department of
Transportation (DOT) funded projects. Dr. Adanu recently won the 2018 best dissertation
award by the Department of Civil, Construction and Environmental Engineering.
Dustin Wood received his PhD from the University of Illinois at Urbana-Champaign in
Social, Personality, and Organizational Psychology. His research has focused on topics
related to personality measurement, personality change, person-environment t, and the
development of functional models for understanding personality processes. His work is
published in Psychological Review, Journal of Personality and Social Psychology,
Psychological Science, and Personality and Social Psychological Review, and edited
books, such as Handbook of Personality: Research and Theory, and Handbook of
Psychological Situations.
Teng Wang is an Assistant Research Scientist at the Texas A&M Transportation Institute
with a demonstrated history of working in the Civil Engineering. His professional and
research interests include Statistical Data Analysis, Transportation Safety and Planning,
Remote Sensing Applications, Railroad Engineering, Transportation Economics and
Policy, GIS, GPS and 3D applications with Connected Vehicle and Automated Vehicle. He
is a strong research professional with a PhD and Professional Engineer (PE) License in the
State of Kentucky focused on Civil Engineering (Transportation).
Steven L Jones has more than 20 years experience in transportation engineering and
planning. He has participated in projects in the United States, Europe, Africa, and Asia.
Jones has served as principal investigator on more than $10 million in externally-spon-
sored projects. He has authored or co-authored more than 150 journal articles, con-
ferences papers, design manuals, and project reports on a range of transportation topics.
He directs the Transportation and Human Development Lab at the University of Alabama.
Jones will spend 2019 in Namibia on a Fulbright Scholar Award.
P. Penmetsa, et al. Technological Forecasting & Social Change 143 (2019) 9–13
13
... The results of the survey found that respondents in age group (18)(19)(20)(21)(22)(23)(24) and (25)(26)(27)(28)(29)(30)(31)(32)(33)(34) have more interest in AVs 43.2% and 50% respectively, including the neutral responses. Interest trend gradually decreased until it reached 15% for respondents over 65þ (see Fig. 19). ...
... While the results presented by Schoettle and Sivak [13], show safer feelings by the participants, when an average of 45.8% held the belief that the occurrence of crashes would decrease, if autonomous vehicles were to replace conventional ones. Similarly, Penmesta et al. [32], found that 62% of survey participants believed the implementation of AVs would lead to a decrease in the frequency of accidents and injuries. However, it should be noted that excessive relying on AVs raises concerns about the potential lack of wisdom in such a dependency. ...
Article
Full-text available
The integration of Autonomous Vehicles (AVs) into our modern society hinges on gaining widespread acceptance from potential road users. To indicate the preparedness of these road users and elucidate their perspectives regarding the use of AVs in future, it is imperative to conduct surveys gauging public acceptance and satisfaction with this emerging mode of transportation. This paper reports the results of a comprehensive questionnaire study involving 1,000 individuals in Gyor City. The survey's primary objective was to assess participants' attitudes and willingness to embrace autonomous vehicles within the city's road networks. The study delved into various socio-demographic factors, such as age, gender, and employment status, while also exploring participants' prior knowledge and opinions regarding the advantages and limitations of AVs. The findings reveal a generally favorable disposition among the public toward the inclusion of AVs in urban traffic, paving the way for the acceptance of mixed traffic patterns. Notably, respondents in younger age groups exhibit greater enthusiasm for incorporating AVs into their daily transportation, whereas individuals aged 65 and above express more reservations, displaying a conservative outlook. Furthermore, participants with prior knowledge and a deeper understanding of AVs exhibit a markedly more positive inclination toward this emerging technology compared to those lacking such familiarity.
... A large body of prior work has investigated public opinions and perceptions toward self-driving cars [51,56,77] and designed user interfaces to support communication between AVs and passengers [7,27,53]. In particular, several scholars have identifed that individual factors such as trust, perceived safety, and socio-cultural norms infuence the users' acceptance of AVs [11,55]. ...
Conference Paper
Full-text available
We call attention to the challenges associated with Global South women's safety in public transportation and investigate the potential of autonomous vehicles (AVs) in providing them with greater mobility and broader opportunities. In a mixed-methods study with Bangladeshi women (n=23), we explored their safety issues, including sexual harassment and assault, to inform AV design, especially for shared rides. Our focus group fndings revealed women's distressing experiences of abuse and undertaken safety measures in public transport of Global South. We conducted co-design sessions utilizing virtual reality (VR) scenarios and investigated participants' perceptions of potential AV designs addressing unique safety concerns and transportation challenges. Participants suggested prioritizing their own safety, achieved through design justice of equitable AV, over the current, often ineffective, retributive justice. Our work contributes to AV design, ICTD, and feminist HCI by suggesting implications for designing community-based and culturally con-textual transportation infrastructure for Bangladeshi women and similar other communities.
... A higher interest in adopting AVs is often observed among individuals well-informed and familiar with the technology, particularly those knowledgeable about the diverse AV service modes and their various advantages (König and Neumayr, 2017;Kyriakidis et al., 2015;Penmetsa et al., 2019;Wang and Akar, 2019). Nevertheless, negative information can decrease the intention to use, while positive information may increase AV acceptance (Nordhoff, et al., 2018;Sanbonmatsu et al., 2018;Yigitcanlar and Inkinen, 2019), and further emphasize the role of policymakers and governments in informing the public about the CAVs technology. ...
Article
Full-text available
This study investigates the attitudes and concerns of the Australian public toward connected and autonomous vehicles (CAVs), and the factors influencing their willingness to adopt this technology. Through a comprehensive survey, a diverse group of respondents provided valuable insights toward various CAV scenarios such as riding in a vehicle with no driver, self-driving public transport, self-driving taxis, and heavy vehicles without drivers. The results highlight the significant impact of safety concerns about automated vehicles on individuals' attitudes across all scenarios. Higher levels of concern were associated with more negative attitudes, and a strong correlation between concerns and opposition underlines the necessity of addressing these apprehensions to build public trust and promote CAV adoption. Interestingly, nearly 70% of respondents felt uncomfortable driving next to a CAV, but they displayed more confidence in adopting automated public transport in the near future. Additionally, around 40% of participants indicated a strong willingness to purchase a CAV, primarily driven by the desire to reduce their carbon footprint and safety considerations. Notably, respondents with health conditions or disability exhibited heightened interest (almost double those without health conditions) in CAV technology. Gender differences emerged in attitudes and preferences toward CAVs, with women expressing a greater level of concern and perceiving higher barriers to CAV deployment. This emphasizes the importance of employing targeted approaches to address the specific concerns of different demographics. The study also underscores the role of trust in technology as a significant barrier to CAV deployment, ranking high among respondents' concerns. To overcome these challenges and facilitate successful CAV deployment, various strategies are suggested, including live demonstrations, dedicated routes for automated public transport, adoption incentives, and addressing liability concerns. The findings from this study offer valuable insights for government agencies, vehicle manufacturers, and stakeholders in promoting the successful implementation of CAVs. By understanding societal acceptance and addressing concerns, decision-makers can devise effective interventions and policies to ensure the safe and widespread adoption of CAVs in Australia. Moreover, vehicle manufacturers can leverage these results to consider design aspects that align with passenger preferences, thereby facilitating the broader acceptance and adoption of CAVs in the future. Finally, this research provides a significant contribution to the understanding of public perception and acceptance of CAVs in the Australian context. By guiding decision-making and informing strategies, the study lays the foundation for a safer and more effective integration of CAVs into the country's transportation landscape.
... Despite its advantages, a major obstacle for ADS to full deployment in society is people's acceptance [4]. The results of some investigations showed that people are not optimistic about ADS currently. ...
Article
Full-text available
With the rapid development in recent years, the autonomous driving system comes to the stage of commercial deployment now. However, it is not well accepted by society. This is due to the fact that the driving behavior features of autonomous driving vehicles are currently different from those of human drivers. It is important to understand how people drive for increasing acceptance. And the primary task of that is driving behavior identification. In this study, we proposed a segmentation method for vehicle driving process into basic directional driving behaviors. In order to clarify the relationship between vehicle motion state and driver operation, we rebuilt the vehicle motion state in the natural coordinate system. We innovatively proposed the concept of cornering strength as a metric of directional driving behavior intensity. To verify the validity of our approach, 22 participants were asked to maneuver a car through some common driving scenarios including turn, lane change, overtaking and U-turn. As a result, our method can extract directional driving behaviors with an average accuracy of 93.33%. In addition, the cornering strength of participants with different driving styles exhibit a significant difference though in the same driving scenario. Driving age has a significant effect on CS stability of participants. The variance of CS reaches a maximum of 0.22. The directional driving behavior features of the same participant can be different influenced by psychological or physiological aspects. Road adhesion condition and traffic congestion condition also have an effect on the CS values of participants.
... Previous studies have used a variety of methodological techniques to evaluate the key determinants of AV use. Many have used statistical methods (e.g., descriptive statistics, ANOVA, Pearson correlation, factor analysis) to understand AV adoption scenarios in different study contexts (Clark et al. 2019;Penmetsa et al. 2019;Schoettle and Sivak 2014a;Xu and Fan 2019). Some studies also used a diversity of more advanced statistical and econometric models such as linear regression model, logit and probit models, seemingly unrelated model, mixed-integer programming, and SEM to explain the key factors of AV adoption and use (Bansal and Kockelman 2017;Castritius et al. 2020;Chaveesuk et al. 2023;Gkartzonikas et al. 2022;Kenesei et al. 2022;Zhang et al. 2018). ...
Article
Full-text available
This study aims to investigate people’s perceptions and opinions on Autonomous Vehicles (AVs) and the key factors that influence their Behavioral Intention (BI) to purchase and use AVs. Data were sourced from the 2019 California Vehicle Survey to explore the determinants of AV purchase. A Structural Equation Model (SEM) of stated intentions is estimated to validate a theoretical framework drawn on relevant bodies of literature. The descriptive statistics show that many people are already aware of AVs. Many people also think that traveling by AVs is enjoyable, safe, and effective, although some of them would miss the joy of driving and would not entrust a driverless AV to shuttle their children. Results from the SEM indicate that being working-age adults, having children, household income, per capita income, and educational attainment are attributes positively associated with AV purchase intention. Similarly, psychological factors (e.g., perceived enjoyment, usefulness, and safety), prior knowledge of AVs, and experience with emerging technologies (e.g., electric vehicles) significantly enhance BI to purchase AVs. This study finds that family structure and psychological factors are the most influential factors of AV purchase intention, and more so than the built environment, transportation, and other socioeconomic factors.
... In recent years, regulations governing the operation of AVs in cyberspace and consumer AV-generated data have garnered the interest of academics, automakers, and decision-makers. Despite not being factored in conventional acceptance models, the literature demonstrates that these dimensions and their associated concerns are major determinants of AV adoption (Penmetsa et al., 2019;Nair and Bhat, 2021). There are, nonetheless, significant knowledge gaps in this domain. ...
Article
Full-text available
No study has systematically investigated the public's perceptions of cybersecurity regulation, data generated by Autonomous Vehicles (AVs), and their relationship with the acceptance of AVs. To fill this knowledge gap, we conducted an exploratory study on public perceptions of cybersecurity regulation and consumer data in AVs acceptance by surveying nationally representative individuals from four OECD countries (US, UK, Australia, and New Zealand). A total of 2062 responses collected from the survey underwent Exploratory Factor Analysis (EFA) to examine constructs such as Cybersecurity Regulation, Data Sharing, Data Usage, Data Concerns, and intention to use AVs. Correlation analysis further explored the relationships between these constructs, while Mann-Whitney U and Kruskal-Wallis H tests assessed the significance of differences across participant groups. The empirical findings indicate that 80% of respondents agreed on the necessity of cybersecurity regulation for AV operations, with 67% perceiving it as a means to enhance AV safety. Surprisingly, 66% supported cybersecurity regulation despite the potential risk of exposing their personal information. Individuals who are more willing to share AV data also expressed a higher likelihood of using AVs. Furthermore, those who agreed more with cybersecurity regulations were more inclined to be compensated for their data transmission while expressing concerns about data storage and processing. Moreover, around 53% of participants feel they should be compensated for sharing their AV data, with 68% expressing concern about AVs' data storage and processing and 71% supporting the destruction of AV data post-sale. Regarding data privacy concerns, “In-vehicle Private Conversation” draws notable attention, rated very important or extremely important by 64% of the participants. The findings highlight the importance of cybersecurity regulation, data sharing, and data concerns in shaping individuals' intentions to use AVs, as well as the influence of socio-technological attributes.
... In most of the cases, the results of the studies which have analyzed common variables, have showed significant differences spatially. For instance, some studies have found the majority of participants to have high or somewhat positive attitudes toward AVs' safety or efficiency (Islam et al., 2022;Penmetsa et al., 2019). As a counter case, the result of a national survey among Irish people showed that only one-fifth of population had a high level of interest and people were mostly unsure about or not likely to trust in the level of safety and security offered by AVs (Rezaei and Caulfield, 2020). ...
Article
The emergence of autonomous vehicles (AVs) is expected to significantly reshape urban mobility and travel behavior patterns. AVs have the potential to offer higher levels of convenience, safety, and accessibility while enabling users to spend their trip time on more efficient and productive tasks such as working or even relaxing. This transformation in the short- to mid-term could result in changes in the public's sensitivity and perception toward enduring longer travel times and consequently, in mid- to long-term, it could influence the willingness to reconsider their residential locations. Therefore, the objective of this study is to enhance the understanding of the potential effects of AVs on travel behavior and land use through the examination of stated preference queries. To achieve this objective, various multinomial logit models toward AVs adoption and residential relocation were estimated by employing a dataset from Istanbul, Türkiye, as an example of megacity in a developing country. While the study findings revealed a set of potential adoption barriers for AVs, they also indicated a notable propensity for adopting these vehicles. Furthermore, concerning individuals' willingness to reconsider their residential locations due to the emergence of AVs, a considerable positive attitude was evident, albeit guarded. This attitude suggests that individuals' decisions are still evolving and can be guided toward the desired future through well-timed and well-suited policies. The outcomes of the study can serve as valuable input for policymakers as well as transportation and urban planners, offering insights into the potential impacts of AVs on urban mobility and form.
... [7] The benefits of AVs extend beyond mere convenience, as they hold the potential to address critical issues associated with traditional transportation. From the reduction of crashes through advanced safety features [8,9] to the positive impact on traffic congestion and environmental concerns, [10] AVs promise transformative benefits. Additionally, the prospect of driverless taxis, [11] changes in car ownership dynamics, [12] and the synergy between AVs and electric vehicles [13] underscore the multifaceted advantages. ...
... People who are enthusiastic about CAVs are typically male, young, highly educated, and live in large urban areas. Furthermore, certain ways of improving AV acceptance, such as information exposure [35,36], direct experience [37], and interaction experience [38], have been examined in existing research. ...
Article
Full-text available
Human-driven vehicles (HDVs) will share the road with connected autonomous vehicles (CAVs) in the near future. Accordingly, the investigation of the interactive behavior of HDV drivers toward CAVs is becoming critical. In this study, a questionnaire survey was first conducted. The heterogenous clusters of HDV drivers were revealed through the latent profile analysis based on the collected dataset, with the focus on their trust and familiarity with CAVs, their attitudes towards sharing the road with CAVs, and their risk perception and perceived behavior control when they faced the CAVs. Subsequently, the correlation between the respective latent cluster and several socio-demographic factors was understood based on the multinomial logistic regression model, and the choice behavior of each cluster in different interactive driving scenarios was revealed. Three vital findings were reported. (1) Three profile clusters of HDV drivers (i.e., negative individuals, neutral individuals, and positive individuals) were revealed. (2) The drivers of a low/middle income and with a long driving experience were more likely to be negative individuals, whereas the CAV experience can make drivers feel positive towards CAVs. (3) Negative individuals might give up on changing lanes when a CAV platoon driving was noticed in the target lanes; in addition, they might raise more rigorous requirements for vehicle spacing in the lane-changing process when finding CAVs driving in the target lanes. To be specific, negative and neutral individuals preferred driving in front of the CAV platoons. The findings can provide references for developing effective management measures or CAV control strategies for transportation systems.
Article
Full-text available
Automobile manufacturers, transportation researchers, and policymakers are interested in knowing the future of connected and autonomous vehicles (CAVs). To this end, this study proposes a new simulation-based fleet evolution framework to forecast Americans’ long-term (year 2015–2045) adoption levels of CAV technologies under eight different scenarios based on 5% and 10% annual drops in technology prices; 0%, 5%, and 10% annual increments in Americans’ willingness to pay (WTP); and changes in government regulations (e.g., mandatory adoption of connectivity on new vehicles). This simulation was calibrated with data obtained from a survey of 2167 Americans, regarding their preferences for CAV technologies (e.g., WTP) and their household’s annual vehicle transaction decisions.
Article
Full-text available
Shared autonomous (fully-automated) vehicles (SAVs) represent an emerging transportation mode for driverless and on-demand transport. Early actors include Google and Europe’s CityMobil2, who seek pilot deployments in low-speed settings. This work investigates SAVs’ potential for U.S. urban areas via multiple applications across the Austin, Texas, network. This work describes advances to existing agent- and network-based SAV simulations by enabling dynamic ride-sharing (DRS, which pools multiple travelers with similar origins, destinations and departure times in the same vehicle), optimizing fleet sizing, and anticipating profitability for operators in settings with no speed limitations on the vehicles and at adoption levels below 10 % of all personal trip-making in the region. Results suggest that DRS reduces average service times (wait times plus in-vehicle travel times) and travel costs for SAV users, even after accounting for extra passenger pick-ups, drop-offs and non-direct routings. While the base-case scenario (serving 56,324 person-trips per day, on average) suggest that a fleet of SAVs allowing for DRS may result in vehicle-miles traveled (VMT) that exceed person-trip miles demanded (due to anticipatory relocations of empty vehicles, between trip calls), it is possible to reduce overall VMT as trip-making intensity (SAV membership) rises and/or DRS users become more flexible in their trip timing and routing. Indeed, DRS appears critical to avoiding new congestion problems, since VMT may increase by over 8 % without any ride-sharing. Finally, these simulation results suggest that a private fleet operator paying $70,000 per new SAV could earn a 19 % annual (long-term) return on investment while offering SAV services at $1.00 per mile for a non-shared trip (which is less than a third of Austin’s average taxi cab fare).
Article
Fully automated self-driving cars, with expected benefits including improved road safety, are closer to becoming a reality. Thus, attention has turned to gauging public perceptions of these autonomous vehicles. To date, surveys have focused on the public as potential passengers of autonomous cars, overlooking other road users who would interact with them. Comparisons with perceptions of other existing vehicles are also lacking. This study surveyed almost 1000 participants on their perceptions, particularly with regards to safety and acceptance of autonomous vehicles. Overall, results revealed that autonomous cars were perceived as a “somewhat low risk“ form of transport and, while concerns existed, there was little opposition to the prospect of their use on public roads. However, compared to human-operated cars, autonomous cars were perceived differently depending on the road user perspective: more risky when a passenger yet less risky when a pedestrian. Autonomous cars were also perceived as more risky than existing autonomous trains. Gender, age and risk-taking had varied relationships with the perceived risk of different vehicle types and general attitudes towards autonomous cars. For instance, males and younger adults displayed greater acceptance. Whilst their adoption of this autonomous technology would seem societally beneficial – due to these groups’ greater propensity for taking road user risks, behaviours linked with poorer road safety – other results suggested it might be premature to draw conclusions on risk-taking and user acceptance. Future studies should therefore continue to investigate people’s perceptions from multiple perspectives, taking into account various road user viewpoints and individual characteristics.
Article
Evidence indicates the importance of walking and biking as a form of transportation, known as active travel (AT), on various health outcomes. Time is one of the most cited barriers to AT. The objective of this study was to examine which variables predict walk and bike discordance (discrepancy between perceived an actual travel time) to campus among faculty, staff, and students. This was a cross-sectional online survey conducted in the Fall of 2014 with a volunteer sample of university students (n = 252) and faculty and staff (n = 253) at a large northeastern university. Participants responded to questions on demographics, psychosocial, AT, AT correlates, and residence. Google maps were used to determine time and distance from their residence to their most frequented campus location, from which discordance was determined. Among faculty and staff, bike discordance was associated with gender, age, biking to/from campus, and AT. Walk discordance was associated with walking to/from campus and distance to campus. Among students, bike discordance was associated with having a parking permit, self-efficacy for biking, gender, age, biking to/from campus, and AT. Walk discordance was associated with having a parking permit and distance to campus. Among faculty and staff, current travel behavior and factors relative to more AT behaviors are important predictors of discordance. Similar results were found among students. Individuals who AT more often likely have more concordance due to behavioral exposure. Likewise, those who are more fit are more likely to be health conscious and thus more likely to incorporate physical activity into other aspects of life. Highlights • Time is one of the most cited barriers to active travel. • Variables associated with discordance (discrepancy between actual travel time and perceived travel time) were determined. • A cross-sectional online survey with a sample of university students, and faculty, and staff at a large northeastern university. • Travel behavior and factors related to more AT behaviors are important predictors of discordance. • Individuals who AT more often and are more fit likely have more concordance due to behavioral exposure.
Article
This study analyzes pedestrian receptivity toward fully autonomous vehicles (FAVs) by developing and validating a pedestrian receptivity questionnaire for FAVs (PRQF). The questionnaire included sixteen survey items based on attitude, social norms, trust, compatibility, and system effectiveness. 482 Participants from the United States (273 males and 209 females, age range: 18–71 years) responded to an online survey. A principal component analysis determined three subscales describing pedestrians’ receptivity toward FAVs: safety, interaction, and compatibility. This factor structure was verified by a confirmatory factor analysis and reliability of each subscale was confirmed (0.7 < Cronbach’s alpha < 0.9). Regression analyses investigated associations with scenario-based responses to the three PRQF subscale scores. Pedestrians’ intention to cross the road in front of FAVs was significantly predicted by both safety and interaction scores, but not by the compatibility score. Accepting FAVs in the existing traffic system was predicted by all three subscale scores. Demographic influence on the receptivity revealed that males and younger respondents were more receptive toward FAVs. Similarly, those from urban areas and people with higher personal innovativeness showed higher receptivity. Finally, a significant effect of pedestrian behavior (as measured by the pedestrian behavior questionnaire) on receptivity is explored. People who show positive behavior believed that the addition of FAVs will improve overall traffic safety. Those who show higher violation, lapse and aggression scores, were found to feel more confident about crossing the road in front of a FAV. This questionnaire can be a potential research tool for designing and improving FAVs for road-users outside the vehicles.
Article
The aim of our study is to examine how positive cognitive evaluations, anxiety-related affects, and the interplay between these two factors influence the willingness to use autonomous cars. We argue that the negative effect of anxiety as well as the interplay of positive evaluations and anxiety within the technology adoption process are contingent on a so far neglected facet of individual motivations, which plays a major role when dealing with anxiety towards unknown, yet status-laden, objects: self-enhancement. By employing a vignette-based online survey, we examined how people assess different levels of autonomous cars. Our results show that positive evaluations of benefits increase, whereas anxiety-related feelings decrease individual willingness to use autonomous cars; moreover, the positive effect of benefit evaluations diminished with increasing levels of anxiety. More importantly, self-enhancement emerged as a pivotal variable in this context: First, the negative effect of anxiety decreased with increasing levels of self-enhancement. Second, the attenuating effect of anxiety on the effects of positive evaluations was less pronounced with increasing levels of self-enhancement. Especially for people with low levels of self-enhancement motivation anxiety-related feelings (e.g., via strengthening self-efficacy beliefs) should be reduced. Moreover, self-enhancement values should be triggered when promoting autonomous cars.
Article
Current research on willingness to use automated cars indicates differences between men and women, with the latter group showing lower usage intentions. This study aims at providing a first explanation of this effect. Research from other fields suggests that affective reactions might be able to explain behavioral intentions and responses towards technology, and that these affects vary depending on age levels. By examining a sample of 1603 participants representative for Germany (in terms of biological sex, age, and education) we found evidence that affective responses towards automotive cars (i.e., anxiety and pleasure) explain (i.e., mediate) the effect of biological sex on willingness to use them. Moreover, we found that these emotional processes vary as a function of respondent age in such a way that the differential effect of sex on anxiety (but not on pleasure) was more pronounced among relatively young respondents and decreased with participants’ age. Our results suggest that addressing anxiety-related responses towards automated cars (e.g., by providing safety-related information) and accentuating especially the pleasurable effects of automated cars (e.g., via advertising) reduce differences between men and women. Addressing the anxiety-related effects in order to reduce sex differences in usage intentions seems to be less relevant for older target groups, whereas promoting the pleasurable responses is equally important across age groups.
Article
Automation with inherent artificial intelligence (AI) is increasingly emerging in diverse applications, for instance, autonomous vehicles and medical assistance devices. However, despite their growing use, there is still noticeable skepticism in society regarding these applications. Drawing an analogy from human social interaction, the concept of trust provides a valid foundation for describing the relationship between humans and automation. Accordingly, this paper explores how firms systematically foster trust regarding applied AI. Based on empirical analysis using nine case studies in the transportation and medical technology industries, our study illustrates the dichotomous constitution of trust in applied AI. Concretely, we emphasize the symbiosis of trust in the technology as well as in the innovating firm and its communication about the technology. In doing so, we provide tangible approaches to increase trust in the technology and illustrate the necessity of a democratic development process for applied AI.